Suppose the Life of a Particular Brand of Calculator Battery

question 49

Multiple Choice

Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a standard deviation of 10 hours. What is the probability that a single battery randomly selected from the population will have a life between 70 and 80 hours?

• A) 0.2412
• B) 0.3830
• C) 0.1712
• D) 0.5121

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